Energy Converter

Convert between joules, calories, kilowatt-hours, BTU, electron volts, and other energy units.

Value

From Unit

Joules (J)

3.6000e+6

Kilojoules (kJ)

3,600

Kilocalories (Cal)

860.42

Kilowatt-hours (kWh)

Watt-hours (Wh)

1,000

BTU

3,412.13

Megajoules (MJ)

3.6

How to Use This Calculator

Enter a value in either field to instantly convert between units. The conversion is bidirectional — updating one side automatically recalculates the other.
Value — The input value. Accepts values from 0 to 999,999,999 (default: 1).
From Unit — enter your preferred option from the dropdown. Choose from: Joules (J), Kilojoules (kJ), Kilocalories (Cal), Calories (cal), Kilowatt-hours (kWh), Watt-hours (Wh), BTU, Electron Volts (eV), Megajoules (MJ). default: 4.
Once all inputs are set, review your results in the Results panel. Here's what each output means:
Joules (J) — your calculated result. This is the primary result of this calculator.
Kilojoules (kJ) — shown as a numeric value.
Kilocalories (Cal) — shown as a numeric value.
Kilowatt-hours (kWh) — shown as a numeric value.
Watt-hours (Wh) — shown as a numeric value.
BTU — shown as a numeric value.
Megajoules (MJ) — shown as a numeric value.
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